Deactivation of a Co-precipitated Co/Al2O3 catalyst
Turkish Journal of Chemistry, vol.31, no.5, pp.515-521, 2007 (SCI-Expanded, Scopus, TRDizin)
- Publication Type: Article / Abstract
- Volume: 31 Issue: 5
- Publication Date: 2007
- Journal Name: Turkish Journal of Chemistry
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
- Page Numbers: pp.515-521
- Keywords: Catalyst deactivation, CO hydrogenation, Co-precipitation, Cobalt-alumina catalysts, Fischer-Tropsch synthesis
- Kocaeli University Affiliated: Yes
Abstract
The effects of reaction temperature, feed ratio, space time, and CO percentage in feed on the deactivation conditions of a co-precipitated 36 wt% Co/Al2O3 catalyst in CO hydrogenation were investigated. Environmental-SEM-EDX and temperature-programmed reduction (TPR) studies were performed on used catalysts to investigate the effect of reaction conditions on catalyst deactivation. Intensive coke deposition on the catalyst was observed at a reaction temperature of about 573 K. Increasing the H2/CO ratioal soi ncreased the catalyst activity. Methane formed as the main product at high H2/CO ratios. Although catalyst activity did not change significantly during the 9-h reaction period at all conditions, a maximum of 6.8% C deposition was observed with increasing H2/CO, and this caused a 2% decrease in the total surface area of the used catalyst. Space time and CO percentage in the feed had less influence on catalyst decomposition. © TÜBİTAK.